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Questions  

If function  f   and  g given by f(x) =log(x1)log(x2) and g(x)=logx1x2  are equal then x lies in the interval 

a
[1,2]
b
[1,2)
c
(2,∞)
d
-∞,∞

detailed solution

Correct option is C

f(x)  is defined for all x satisfying x−1>0  and  x−2>0 i.e. x>2 Domain (f)=(2,∞)                       .......              (i)gx  is defined for all x satisfyingx−1x−2>0⇒x∈(−∞,1)∪(2,∞)Domain (g)=(−∞,1)∪(2,∞)      ……….(ii) Thus f(x)  and  g(x) are equal for all x belonging to theircommon domain i.e  (2,∞)

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